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公开(公告)号：DE60310237D1
公开(公告)日：2007-01-18
申请号：DE60310237
申请日：2003-08-19
Applicant: QUALCOMM INC
Inventor： MEDVEDEV IRINA , WALTON ROD , KETCHUM W
Abstract: Techniques to perform selective channel inversion per eigenmode in a MIMO system to achieve high spectral efficiency while reducing complexity at both the transmitter and receiver are presented. The available transmission channels are arranged into a number of groups, where each group may include all transmission channels (or frequency bins) for a respective eigenmode of a MIMO channel. The total transmit power is allocated to the groups using a particular group power allocation scheme. Selective channel inversion is then performed independently for each group selected for use for data transmission. For each such group, one or more transmission channels in the group are selected for use, and a scaling factor is determined for each selected channel such that all selected channels for the group achieve similar received signal quality (e.g., received SNR).
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Patent Agency Ranking
公开(公告)号：DE60211705T2
公开(公告)日：2007-01-11
申请号：DE60211705
申请日：2002-06-25
Applicant: QUALCOMM INC
IPC: H04B7/005 , H04J99/00 , H04B7/04 , H04B7/06 , H04B7/26 , H04J11/00 , H04L1/00 , H04L1/06 , H04L5/06 , H04L25/03 , H04L27/26 , H04W52/24 , H04W52/26 , H04W52/34 , H04W52/42 , H04W52/50
Abstract: Techniques to select transmission channels for use for data transmission and to process and transmit data over the selected transmission channels. Transmission channels available for use are segregated into one or more groups, with each group including any number of channels. With selective channel transmission, only "good" channels in each group are selected (e.g., based on the channels' received SNRs and an SNR threshold), "bad" channels are not used, and the total available transmit power for the group is (e.g., uniformly) distributed across only the good channels. Each group may also be associated with a respective coding and modulation scheme, and data for each group may be coded and modulated based on the scheme selected for the group. Improved performance is achieved by using only good channels in each group and matching the data processing for the selected channels to the capacity achievable by the channels.
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公开(公告)号：DE60215811T2
公开(公告)日：2007-09-13
申请号：DE60215811
申请日：2002-06-13
Applicant: QUALCOMM INC
IPC: H04B7/06 , H04J99/00 , H04B7/005 , H04B7/04 , H04B7/26 , H04J11/00 , H04L1/00 , H04L1/06 , H04L5/06 , H04L25/03 , H04L27/26
Abstract: Techniques to process data for transmission over multiple transmission channels. The available transmission channels are segregated into one or more groups, and the channels in each group are selected for use for data transmission. Data for each group is coded and modulated based on a particular coding and modulation scheme to provide modulation symbols, and the modulation symbols for each selected channel are weighted based on an assigned weight. The weighting "inverts" the selected channels such that they achieve similar received SNRs. With selective channel inversion, only "good" channels in each group having SNRs at or above a particular threshold are selected, "bad" channels are not used, and the total available transmit power for the group is distributed across the good channels in the group. Improved performance is achieved by using only good channels in each group and matching each selected channel's received SNR to the required SNR.
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公开(公告)号：DE60215811D1
公开(公告)日：2006-12-14
申请号：DE60215811
申请日：2002-06-13
Applicant: QUALCOMM INC
IPC: H04B7/06 , H04J99/00 , H04B7/005 , H04B7/04 , H04B7/26 , H04J11/00 , H04L1/00 , H04L1/06 , H04L5/06 , H04L25/03 , H04L27/26
Abstract: Techniques to process data for transmission over multiple transmission channels. The available transmission channels are segregated into one or more groups, and the channels in each group are selected for use for data transmission. Data for each group is coded and modulated based on a particular coding and modulation scheme to provide modulation symbols, and the modulation symbols for each selected channel are weighted based on an assigned weight. The weighting "inverts" the selected channels such that they achieve similar received SNRs. With selective channel inversion, only "good" channels in each group having SNRs at or above a particular threshold are selected, "bad" channels are not used, and the total available transmit power for the group is distributed across the good channels in the group. Improved performance is achieved by using only good channels in each group and matching each selected channel's received SNR to the required SNR.
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公开(公告)号：DE60310237T2
公开(公告)日：2007-06-28
申请号：DE60310237
申请日：2003-08-19
Applicant: QUALCOMM INC
Inventor： MEDVEDEV IRINA , WALTON ROD , KETCHUM W
Abstract: Techniques to perform selective channel inversion per eigenmode in a MIMO system to achieve high spectral efficiency while reducing complexity at both the transmitter and receiver are presented. The available transmission channels are arranged into a number of groups, where each group may include all transmission channels (or frequency bins) for a respective eigenmode of a MIMO channel. The total transmit power is allocated to the groups using a particular group power allocation scheme. Selective channel inversion is then performed independently for each group selected for use for data transmission. For each such group, one or more transmission channels in the group are selected for use, and a scaling factor is determined for each selected channel such that all selected channels for the group achieve similar received signal quality (e.g., received SNR).
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公开(公告)号：DE60211705D1
公开(公告)日：2006-06-29
申请号：DE60211705
申请日：2002-06-25
Applicant: QUALCOMM INC
IPC: H04B7/005 , H04J99/00 , H04B7/04 , H04B7/06 , H04B7/26 , H04J11/00 , H04L1/00 , H04L1/06 , H04L5/06 , H04L25/03 , H04L27/26 , H04W52/24 , H04W52/26 , H04W52/34 , H04W52/42 , H04W52/50
Abstract: Techniques to select transmission channels for use for data transmission and to process and transmit data over the selected transmission channels. Transmission channels available for use are segregated into one or more groups, with each group including any number of channels. With selective channel transmission, only "good" channels in each group are selected (e.g., based on the channels' received SNRs and an SNR threshold), "bad" channels are not used, and the total available transmit power for the group is (e.g., uniformly) distributed across only the good channels. Each group may also be associated with a respective coding and modulation scheme, and data for each group may be coded and modulated based on the scheme selected for the group. Improved performance is achieved by using only good channels in each group and matching the data processing for the selected channels to the capacity achievable by the channels.
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